Britain declared war on Germany on 3 September 1939 after Hitler's invasion of Poland. France fell in June 1940 and for a year Britain and its empire stood alone against Nazi Germany. Winston Churchill became Prime Minister in May 1940 and his speeches rallied the country. The Battle of Britain in the summer of 1940 saw RAF fighters narrowly defeat the German Luftwaffe in the skies over southern England.
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After the United States and the Soviet Union joined the war in 1941, the tide gradually turned. Allied forces commanded by General Eisenhower landed in Normandy on D-Day, 6 June 1944. Germany surrendered on 8 May 1945 (VE Day) and Japan on 15 August (VJ Day) after the atomic bombings of Hiroshima and Nagasaki.
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